Duplicator



y 1930- h H. K. LORENTZEN 1,760,152

DUPLI CATOR Filed March 25. 1926 10 Sheets-Sheet 1 May 27-, 1930. H. K. LORENTZEN 6 DUPLIGATOR Filed March 25. 1926 10 Sheets-Sheet 2 y 1930. H. K. LORENTZEN 1,760,152

DUPLICATOR Filed March 25, 1926 i 10 Sheet si-Sheet 3 K a oentoz I a zk /l y 1930. H. K. LORE NTZEN 1,760,152

DUPLI CATOR Filed March 25, 1926 10 Sheets-Sheet 4 y 27, 1930- H. K. LORENTZEN 1,760,152

DUPLICATOR Filed March 25, 1926 10 Sheets-Sheet 5 y 1930. H. K. LORENTZEN 1,760,152

DUPLI CAT OR Filed March 25. 1926 10 Sheets-Sheet 6 MWM May 27, 1930.

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Willi! "IT I III II H. K. LORENTZEN DUPLICATOR Filed March 25, 1926' 10 Sheets-Sheet .7

y 1930. H. K, LORENTZEN 1,760,152

DUPLICATOR Filed March 25, 1926 10 Sheets-Sheet 8 y 1930. H. K. LORENTZEN 1,760,152

DUPLICATOR Filed March 25, 1926 7 1O Sheets-Sheet 9 wk Wlnuantoz' y 7, 1930. H. K. LORENTZEN 1,760,152

DUPLICATOR Filed March 25, 1926 10 Sheets-Sheet l0 Patented May 27, 1930 HANS K. LORENTZEN, OF NEW YORK, N. Y.

DUPLIG'ATOR RElSSUliD 7 Application filed March 25, 1926. Serial No. 97,189.

This invention relates to duplicators, especi ally to that type of duplicators in which the gelatinized surface is formed on the periphery of a rotatable cylinder.

It is an object of the invention to provide improved and simple means for feeding the blank sheets of paper into the machine in proper timed relation to the cycle of operation of the machine and further to provide H3 mechanism for smoothly pressing the sheets against the gelatinized surface.

Another feature of the invention resides in the means for automatically stripping the sheets from the gelatinized surface and posii tively discharging them from the machine.

Other features are found in the arrangement of parts facilitating the adjustment and replacement of the gelatin rolls, as well as in the means for controlling the movement 2.0 of the revolving drums.

lVhile I have disclosed a preferred embodiment of the machine for purposes of illustration, it should be understood that the structure may be modified in various ways 2-? without departure from the true spirit and scope of the invention as hereinafter defined and claimed.

In the drawings;

Fig. 1 is an elevation of the right hand side of the machine;

Fig. 2 is an elevation of the left hand side of the machine;

Fig. 3 is a top plan view of the machine;

Fig. 4 is a central vertical sectionon the .5 line 44 of Fig. 3; i

Fig. 3 is an elevation of the right hand side of the impression drum and shows the mechanism for securing the gelatin spindle rolls;

Fig. 6 is a horizontal section on the line 66 of Fig. 5, and shows the spindle securing mechanism in locked position;

Fig. 7 is a view similar to Fig. 6' but shows one of the spindles removed and its pivot gate in unlocked position;

i Figs. 8 to 11 are diagrammatic views of the impression drum and gelatin rolls mounted therein showing the procedure for interchanging the gelatin rolls;

Fig. 12 is a fragmentary view of the stripper drum;

Fig. 13 is a section taken on line 13-13 of Fig. 12 and shows the gripper fingers in open position;

Figs. 14 to 16 are detail views showing the manner of mounting the heads on the gripper fingers;

Fig 17 is a fragmentary view showing details of the feeding mechanism;

Fig. 18 is a fragmentary section showing the gripper fingers about to grip the freeoo end of the printed sheet;

Fig. 19 is a detail view showing the manner in which the gripper fingers grip the paper;

Figs-20 to 22 are detail views of the clutch and brake mechanism;

Figs. 23 to 25 are detail views of one of the adjustable paper guides.

The framework of the machine includes two side frames 10 connected by suitable tie members and carrying in journals the impression drum 11. The left end of the impression drum carries the gear teeth 12 which mesh with teeth 13 formed on the stripper drum 14, the latter also being journaled in the framework. The stripper drum is driven through a reduction gear 15 by an electric motor 16. p

The impression drum is composed of two v end members 17 and 18 and a peripheral'surface 19 that extends over more'than half of the circumference of the drum. The peripheral surface is covered by a layer of felt 20 to provide a cushion support for the gelatin paper 21. The gelatin paper after passing 35 over the peripheral surface of the drum is carried around a guide roller 22 located at each end of the surface 19, and has one of its ends attached to the hollow delivery spindle 23 and its opposite end attached to the hollow receiving s indle 24. The end member 18 carries stu s 25 adapted to rotatably support one end of each of the spindles 23 and 24. The opposite ends of spindles 23 and 24 are supported and rotated through studs 26 carried by pivoted gates 27 which are identically constructed and move about pivot 28. Each gate is biased to open position by a co: pression spring 29 and carries an angular projection 30 that limits the openso 51 adjustably mounted on the stripper drum" 14. A spring 52 tends to depress the'arm 49.

ing movement of the gate. The inner part of stud 26carries a cross pin 31 for engaging notches 32 formed in the end of the spindle. The outer end of the stud is squared at 33 for cooperation with a detachable crank and carries a ratchet wheel 34. A pawl 35 pivoted to cooperate with the ratchet wheel, carries a handle 36 and is provided with a spring 37 arranged to move across deadcenter and hold the dog in either engaged or disengaged position. The gate is held in closed position by a pivoted spring latch 38.

The inclined feed table 39 is attached to the upper part of the .framework' and carries at its lower end an angular pocket 40 (Fig. 4) adapted to holdthesheets which are to receive the impressions. The shaft 41, which extends across the framein front of pocket 40, carries'the feed rolls 42 .and is driven from stripper drum 14 by gearing arranged to give rolls 42 the same periperal speed as that of theimpression drum 1-1. The delivery chute 43, which is carried by shaft 44, has idler r0lls45 extending through its lower member 46 and has a curved upper guard-member 47. An apron 48 is loosely supported on the member 46 and falls by gravity against the sheets in the pocket. A

Shaft 44 carries at, one end an arm 49 having a roller 50 cooperating with a cam A shaft 53 is mounted on the pivoted arms 54 and carries the platen roller 55. Each of the arms 54 carries a stub shaft 55 on I which is journaled a roller 56 cooperating with a cam 57 on the impression drum 11'.

" A spring 58- tend's to depress arms 54.

, During the operation of themachine the top sheet of paper is lifted from the stack in the pocket until it is free from the apron.

It is then allowed to' fall down over the apron into the delivery chute to the dotted this position the-idler rolls 45 press the sheet against feed rolls 42 which feed it through stationary guides 61 and 62 into contact with the platen roller. Just after the sheet has passed under the platen roller the rollers-56am allowed to descend by cams 57, thereby causing the platen roller to press the sheet against the gelatin paper on surface 19. It will be noted that the delivery of the sheet is so timed that its forward edge projects beyond the gelatinized surface. It should further be noted that the paper is directed in such a manner that it first contacts with the platen roller which presses it evenly and positivelyagainst the gelatinized surface. air between the paper and the gelatinized surface of impression roll and insures an even impression.

The stripper drum carries near its periph-- cry a shaft 63 upon which are mounted a plurality of angular stripper fingers 64. These stripperfingers normally lie below the surface 65 of the drum, but at a certain position of the shaft 63'they project through openings 66 inthe surface 65. The shaft 63 also carries loosely journaled thereon a plurality of gripper'fingers 67, the ends of which carryheads 68 universally pivoted thereon This procedure avoids trapping as shown in Figs. 14-16. A spring 69 normally holds each gripper finger in the position shown in'Fig.v 4 with its head in contact with a surface 70, extending inwardly at an angle from the surface of the drum. The

shaft carries a pin 71 adapted to engage the finger 67 upon certain movement of shaft and move the finger outwardly to the position shown in Fig. 18. 'An arm-72 is mounted on one end of shaft 63 and carries a roller 73 riding along a stationary cam'74 mounted ,on the framework of the machine.

After the sheet of paper hasbeen rolled ,into contact with the impression drum it'is carried by said drum until it reaches the position shown in Fig. 1-8, and meanwhilev rum has assume the position the stripper s the, drums continue to roillustrated.

tate the roller 73 rides down off the high part of cam 74, permitting springs 69 i to close the gripping fingers upon the projecting end of the. sheet as shown in Fig-19.

It should be noted that the snubbing member 75 provides a projecting ledge 76 which acts as a sort of snubbing post about which the sheet of paper is bent to give added firmness to the grip of the gripping fingers. The

use of a plurality of spring-pressed gripper fingers provides for a uniform metal-to-metal grip along the end of the sheet.

Y As the stripper drum 00111111118510 rotate it will carry the sheet along with it until the roller 73 again rides up the high part of the cam 7 4, thereby causing the gripper fingers to release the sheet and moving the gripper fingers outwardly to positively push j the sheet from the stripper roll. This posi-. tive discharge of the sheet prevents its adhesion tothe-roll on account ofstatic electricity on any other..cause. .The sheets are disi charged into the pain 77.

The motor 16 is connected to the driving gears by a clutch 78 of a conventional typewhich is controlled by lever 79. A second control lever 80 is pivoted on theopposite side of the frame and is connected to lever 79, so that the clutch can be operated'from either side of the machine. A brake 81 is mounted on the outer end of the clutch shaft and is operated by a lever 82. A pin 83 is carried by lever 79 and is adapted to move lever 82 to braking position and to hold the lever in such position by engaging in a notch 84 formed in lever 82. IVhen lever 79 is in one extreme position the clutch is thrown into engagement; when it is in central position the clutch is disengaged; while when it is in the other extreme position the brake is applied and locked in braking position.

It will be understood that the matter to be reproduced is impressed upon the gelatinized surface in a well-known manner. After a run has been made from one section of the gelatin paper it is desirable to bring a fresh section into position. In performing this operation the brake is first applied and locked, thereby holding the drums immovable. The pawl 35 controlling the delivery spindle 23 is then thrown out of engagement with its ratchet the crank is applied to the shaft 33 of receiving spindle 24, and the used portion of the gelatin paper is wound on to.

the receiving roll. The pawl 35 is then returned to stop rotation of spindle 23 and spindle 24 is further rotated to tighten the gelatin paper upon the drum.

After all of the gelatin a-per has been used over and has been wounonto the receiving roll, as shown in Fig. 8, it becomes necessary to interchange the position of the rolls, if the gelatin paper is capable of further use, or to insert a fresh roll. In order to facilitate this interchange alining and supporting brackets 84 and 85 are attached to the frame above the impression drum. Bracket 84 carries a stub 86 adapted to fit within the spindle and having a pin 87 adapted to engage the notches formed in the spindle, while bracket 85 carries a U-shaped saddle 88.

With the impression drum locked in the.

position illustrated in- Fig. 8, the gate 27 holding the delivery spindle 23 in position is opened and this spindle is removed from the drum and the end of the paper is detached therefrom. This spindle is now placed in the brackets 84 and 85. The spindle 24 carrying the paper thereon is now removed from the receiving position and is placed in the delivery position as shown in Fig. 9. If necessary a fresh gelatin roll is placed in the delivery position. The end of the gelatin paper is now placed around the spindle on the alining brackets and is attached by a spring clip. The alining brackets are accurately positioned so thatwhen the spindles are in the positions of Fig. .9 they are exactly parallel, and hence the paper will be properly alined upon the receiving spindle. The brake is now released and the impression drum is moved by hand, rim 89 being provided for this purpose, in the reverse direction as shown in Fig. 10 to lead the gelatin paper across the surface of the drum. This reverse rotation is continued until the parts reach the posi- I tion shown in Fig. 11, when the brake is again locked. The spindle on the alining brackets is now placed in the receiving position within the drum and the paper tightened as previously explained.

The feed table 39 carries two paper guides 90 composed as shown in Figs. 23 to 25, of an L-shaped guidecmember 91, and a supporting arm 92. A spring arm 93 is adapted to ride in a guide-way 94 formed below the table and frictionally grip the table. To further i1nprove the frictional grip a spring 95 is mounted on the framework of the machine and presses against the spring arm 93. The guide is thus'accurately alined by the guideway 94 and is frictionally held in any work ing position without the use of set screws or similar fastening devices.

It will be clear from the above description that the duplicator is adapted to be rotated continuously by the electric motor, although it can be instantly stopped by movement of either lever 79 or lever 80. The sheets are fed by hand into the delivery chute which delivers 'them at exactly the proper time to the feed rolls, which are moving at the same peripheral speed as the impression drum. The feed rolls deliver the sheet to the platen roller which presses the paper evenly and with uniform pressure upon the impression drum. As the impression drum rotates the projecting en-dof the'shet is grasped by the gripper fingers and the sheet is smoothly pulled from the gelatinized surface of the impression drum'and is carried around by the stripper drum until the gripper fingers release the sheet and the stripper fingers positively discharge it from the stripper drum.

The construction of'the impression drum provides for easy replacement and adjustment of the gelatin rolls, while the alining brackets insure even windingof the. paper upon the receiving spindle.

What I claim is:

1. In a rotary duplicator, an impression drum, automatic. means for feeding a sheet of paper to said drum in timed relation to the movement of said drum. a feed roller, and a tiltable bed for moving the sheet of paper into contact with the feed roller.

2. In a rotary duplicator, an impression drum, a feed roller, and a tiltable bed for moving a sheet of paper against the feed roller. v

3. In a rotary duplicator, an impression drum having a gelatiniz'ed surface means to feed a sheet of paper to said druni with one end projecting beyond the gelatinized surface, and means for positively gripping the projecting end of the paper.

4. In a rotary duplicator, an impression drum, stub shafts carried by saiddrum, and a hollow spindle carrying 'a roll of gelatin paper and mounted on said stub shafts; one

of said stub shafts being movably supported to admit ready mounting and dismounting of the spindle.

5. In a duplicator, an im res'sion drum,

. 5 stub shafts carried by sai drum, a 'hollow spindle carrying gelatin paper, and stub shafts upon which the hollow spindle is mounted, one of said stub shaftsbeing movably supported to admit ready mounting and dismounting of the spindle.

- 6. In a rotary duplicator, an impression drum, stub shafts carried by said drum, a hollow spindle carrying gelatin paper, a notch formed in one end of the' spindle, stub 'shafts upon which the spindle is mounted,

one of said shafts having a pin adapted to engage in the notch of the spindle, and a hinged gate supporting one of the shafts, for easy insertion and removal of the spindle.

7. In a rotary duplicator, an impression drum, a gelatin roll mounted in said drum, one end of said roll being carried by a movable gate, and a latch retaining the gate in closed position.

5 v8. In a rotary duplicator, a frame, an impression drum journaled-in said frame, a spindle mounted in said drum and adapted to carry gelatin paper, and brackets mounted on. said frame for alining the gelatin paper on 3 said spindle.

9. In a rotary duplicator, a rotatable impression drum having gelatin roll carrying spindles mounted therein, part of the periphery of said drum being open, and means to lock the impression drum against-movement with its open part accessible to the operator.

10. In a rotary duplicator, a rotatable impression drum having gelatin roll carrying spindles mounted therein, part of the periph- 40 ery of said drum being open, and means'to lock the impression drum in any desired position.

11..Ina rotary duplicator, a frame, an impression drum journaled in said frame, an

impression surface on thedrum, means for carrying aroll of gelatin paper within the drum, and means on the frame for holding one end of the paper while the paper is being drawn over the impression surface. In testimony whereof I affix my signature.

HANS K. LORENTZEN. 

